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The tunnels of the Underground City run beneath Beijing's city center, covering an area of 85 square kilometres (33 sq mi) 8 to 18 metres (26–59 ft) under the surface. [ 1 ] [ 2 ] At one time there were about 90 entrances to the complex, all of which were hidden in shops along the main streets of Qianmen . [ 5 ]
A report written by a Georgetown University team led by Phillip Karber conducted a three-year study mapping out China's complex tunnel system, which stretches 5,000 km (3,000 miles). The report determined that the size of the Chinese nuclear arsenal is understated and as many as 3,000 nuclear warheads may be stored in the tunnel network.
Construction of the tunnel started in 1961 and was completed on 22 March 1966, a few years after the Second Taiwan Strait Crisis in 1958 between the Republic of China Armed Forces and People's Liberation Army. Due to the lack of manpower and money to maintain the tunnel, it was closed and abandoned in 1986.
They are sloped criss-crossing tunnels which connect the midpoints of the five water tunnels (four headrace and one drainage) to the road tunnels beside and slightly above them. Totalling 210,000 m 3 (7.4 × 10 ^ 6 cu ft), [ 24 ] : 4 and originally intended to be blocked off after construction, [ 23 ] : 20 they have been donated to the ...
Underground Project 131 (Chinese: "131"地下工程; pinyin: "131" Dìxià gōngchéng) is a system of tunnels in Hubei province constructed in the late 1960s and the early 1970s to accommodate the Chinese People's Liberation Army command headquarters in case of a nuclear war. The facility was never fully completed or used, and is currently ...
Dayingshan #4 Hydroelectric Power Station Water Tunnel Yunnan, China 13,932 m (8.657 mi) 2009 8.5 m in diameter (57m 2 cross section) Railway Hokuriku Tunnel: Fukui Prefecture, Japan 13,870 m (8.618 mi) 1962 Part of the Hokuriku Main Line: Railway Single Tube Xiapu Tunnel: Fujian, China 13,838 m (8.599 mi) 2009 Railway Twin Tube Yesanguan Tunnel
There are four classes of road tunnels in China by length. [1]Super-long tunnel (>3,000m) Long tunnel (1,000m-3,000m) Middle-tunnel (250m-1,000m) Short tunnel (<250m) By 2012, there are 10,022 road tunnels and 8,052.7 km in total length in mainland China, including 441 super-long tunnels with 1,984.8 km in total length and 1,944 long tunnels with 3,304.4 km in total length.
This list of tunnels in China includes any road, rail or waterway tunnel in China. Beijing. Xiaoyue Tunnel; Chongqing. Baiyun Tunnel (cross-mountain) (road)